Leaning wheel grader



F. E. ARNDT June 19, 1934.

LEANING WHEEL GRADER 5 Sheets-Sheet 1 Filed Dec. 13, 1930 June 19, 1934.F. E. ARNDT LEANING WHEEL GRADER 13, 1930 3 Sheets-Sheet 3 Filed Dec.

Patented June 19, 1934 UNITED STATES LEANING W HEEL GKADER Franklin E.Arndt, Gallon, Ohio, assignor to The Gallon Iron Works & Mfg. 00.,Galion, Ohio,

a corporation of Ohio Application December 13, 1930, Serial No. 502,222

21 Claims.

This invention relates to leaning wheel graders of the general characterdisclosed in my former Patents 1,655,303 and 1,579,803. In Patent No.1,655,303, there was a main frame made up of articulated sections. Therear sections were relatively short and were pivotally connected to theforward sections for lateral swinging movement. Mounted upon theextremities of these rear sections for swinging movement therewith was arear axle and carried by this rear axle were the two rear wheels mountedupon knuckles so that they could be canted from a vertical plane into adownwardly inclined position in either direction. In this patent the tworear sections which supported the rear axle are at all times in parallelrelation to each other and the rear axle remains in a vertical planethroughout all of its movements. The wheels could be leaned to the rightor to the left but no means was provided to cause the rear wheels totend to run toward the road or toward the work. It was diflicult withthis machine to hold the blade to the work.

In Arndt Patent 1,679,803, means was provided to automatically skew therear axle or turn it on a vertical pivot when the rear axle was shiftedto one side or the other of the longitudinal center line of the machine.The skewing of the rear axle positioned the rear wheels so that theywould tend to run toward the road and thereby hold the blade to itswork.

However,if the grader shown in Patent 1,679,803 was being used for banksloping or cutting down a bank and widening the road it was necessary toshift the rear axle in a direction to cause the wheels to run in adirection which would not hold the blade to its work. In other words, ifthe rear axle was shifted to the left with the rear section of themachine, this would cause the rear wheels to tend to run to the left,and yet in bank sloping it might be very desirable to shift the rearaxle to the left and yet have the rear wheels tend to run to the right.Thus my present invention particularly relates to means whereby the rearwheels may be automatically shifted into a position to cause the machineto tend to shift laterally toward the work to thus counteract thelateral draft in the opposite direction caused by the action of the workagainst a laterally inclined scraper or mold board and the object ofthis invent on is to provide, generally speaking, a construction suchthat when the rear section of the frame of the rear axle is shiftedlaterally from a medial position in either direction and the wheels areleaned, the wheels shall be shifted around a vertical axis as it were tocause the wheels to run toward the right or toward the left.

One of the objects of the present invention therefore is to providemeans for bodily shifting the wheels laterally while maintaining therear axle frame at all times at right angles to the line of draft andcombining with suchshifting means, mechanism for leaning the wheelseither to the right or left while automatically shifting the axes of thewheels to cause the wheels to run toward the right or toward the left tocounteract the tendency of the mold board to shift the rear end of themachine laterally. For instance, if the mold board is inclined from thecenter of a narrow road toward the upper level of a bank at the side ofthe road and it is desired to widen the road by cutting down the bankand cause the mold board to move the material farther away from thecenter of the road, the rear wheels may be shifted to the left so as tobring the right-hand front and rear wheels into alinement parallel tothe right-hand line to which the road is to be widened. Then uponshifting the rear wheels into vertical planes their tops will be shiftedtoward the right with the result that the individual axes of the wheelswill be automatically shifted into positions to cause the wheels to tendto run toward the said right-hand line, thus counteracting the tendencyof the mold board to shift the rear end of the machine toward the centerof the road. In the same manner if the upwardly sloping bank at theleft-hand side of the road is to be cut off and the material movedfurther away from the center of the road, the rear wheels may be shiftedtoward the right, and the tops of the wheels leaned toward the leftwhich will shift the rear wheel axes individually into such positions asto cause the rear wheels to tend to run further away from the center ofthe road to counteract the tendency of the mold board to shift the rearend of the machine toward the center of the road. While the leaning ofthe wheels and the shifting of the axes of the wheels areinterdependent, such leaning and shifting are independent of themechanism for shifting the rear wheels laterally. However, the mechanismfor shifting the rear wheels laterally co-operates with the leaningmechanism and the means for shifting the axes of the wheels; to supportthe rear'wheels in the desired positions relative to the front wheels,in the desired vertical planes, and for the desired direction of travel,while the rear'axle remains at right angles to the line of draft of themachine.

A further object is to prov-idea construction of this character in whichthe pivots for the knuckles of the rear wheels are not disposed in anabsolutely horizontal plane as was the case in my Patent No. 1,655,303,for instance, but wherein the pivots for the knuckles are disposed in aplane inclined. to the horizontal, as for instance, downwardly andforwardly, so that if the wheels are leaned in one direction or theother, they will be at the same time slightly turned in a horizontalplane in one lateral direction or the other.

A further object is to provide a construction of this character whereinthe shifting toward the right or left from the center line of themachine of the rear axle has nothing whatever to do with causing thewheels to run in a direction toward the right or left, but wherein ifthe axle is shifted to the right or left and it is desirable to have thewheels run to the left in the one case or right in the other, the wheelsare leaned as toward the right or toward the left, this leaning actionautomatically causing the wheels to turn about a vertical axis to causethe machine to move laterally in the direction desired.

Another object of the invention is to provide parallel motion mechanismfor shifting the rear axle laterally so that the latter may bemaintained at all times at right angles to the line of draft of themachine, such parallel motion mechanism comprising spaced-apart parallelbars symmetrically connected to the axle so as to maintain uniform' thedistribution of the pull exerted on the rear axle, and combining withsuch parallel motion mechanism independently operable means for varyingthe inclination or leaning of the wheels and the direction of the travelthereof, the mechanism for supporting the wheels in their adjustedpositions cooperating with the parallel motion mechanism to hold thewheels in the desired positions when the grader including the mold boardis being operated while the latter is in an adjusted angular position.

Other objects will appear in the course of the following description.

My invention is illustrated in theaccompanying drawings, wherein Figure1 is a side elevation of a leaning wheel grader constructed inaccordance with my invention;

Figure 2 is a section on the line 2-2 of Figure 3 Figure 3 is afragmentary rear elevation of the grader;

Figure 4 is a fragmentary top plan View thereof, particularly insection; I

Figure 5 is a section on the line 55 of Figure 4;

Figure 6 is a section on the line 6-6 of Figure 4;

Figure 7 is a plan view of one of the skew pivot blocks disposed betweenthe axles;

Figure 8 is a diagrammatic plan view illustrating the manner in whichthe rear wheels when canted tend to guide the rear end of the machinetoward the left. a I

Referring to Figure 1, it will be seen that therein I have illustratedan elevational view of a leaning wheel grader of the general characterreferred to. The frame of the grader includes the longitudinallyextending frame beams 10 which are upwardly arched, the forward ends ofthe frame beams being operatively connected to each other and mountedupon a bolster in turn connected to the front axle-in'any suitable ordesired manner. This front axle 11 carries the usual tongue 12 and theusual front wheels 13.

This frame supports the draw bars 14 which in turn support the circle 15upon which the scraper or mold board 16 is mounted. The means forraising or lowering the draw bars or rotating the circle to angle theblade are not part of the present invention. Therefore, all partsextraneous to the present invention are omitted from the drawings.

The rear ends of the frame beams 10 may be horizontal or may asillustrated be connected to horizontal angle irons 17, the horizontalangle irons supporting a platform upon which the operator may stand. Itwill be noted from Figure 4, that upright elements 18 are attached tothe forward ends of the angle irons 17 and that to the rear faces ofthese upright members 18 are attached the angles 19 and 20. These angles19 and 20 may be rigidly connected to each other and riveted orotherwise attached to the vertical members 18 or they may be simplyangle irons attached to these members 18.

These angle irons l9 and 20 have horizontally disposed portions to carrypins or bolts 21. Preferably the angle iron 20 will extend entirelyacross the rear end of the machine.

The rear axle structure embraces a frame indicated generally at 21a, theaxle broadly considered including two angle irons 22 and 23 extendingtransversely of the machine, this angle iron axle supporting, in amanner to be hereafter stated, the knuckles of the rear wheels. Thisaxle is operatively connected adjacent its opposite ends tolongitudinally extending links 24 or parallel bars. These each consistof a length of steel bent upon itself so that each bar has the form ofan elongated U, each bar at its b ight end having welded therein thevertically ex-' tending sleeve 25. Disposed above and below the axle isa vertically disposed fork like member or axle end 26 having a shankdesignated generally 27, this shank being formed with two transverselyextending bolt holes 28. The free ends of each U-shaped link or bar 24embrace this shank 27 and bolts 29 pass through the ends of each bar orlink and through the bolt holes 28, thus holding the axle end or fork 26to these bars 24. It is to be understood that these bars 24 whatevertheir form, constitute in effect rear sections of the supporting frameof the machine so that the supporting frame is thus formed of twoarticulated sections, that is, a forward section supported at itsforward end by the forward wheels and a rear section supported at itsrear end by the rear wheels and pivoted to the forward section.

Disposed between the angle irons 22 and 23 of the rear axle is a skewpivot block designated generally 30.

This consists of a malleable iron casting formed to provide two parallelspaced horizontal bolt receiving sleeves 31 connected by a web 32, avertical web 33. intersecting the web 32 at its middle, this verticalweb 33 having its edge face cut away at its middle and being designed tobear against the inner faces of the angle irons 22 and 23. Bolts 34 passthrough the angle irons 22 and 23 and through the sleeves 31 to hold theskew pivot blocks in position upon the axle. Each block is formed at itscenter with a vertically extending bearing sleeve 35 which is adapted toaline with eyes 36 formed in the ends of the fork 26. A pivot bolt 37passes vertically through the eyes 36 and through the sleeve 35.

It is to be particularly noted from Figure 6 that while the sleeve 35 isvertical, the sleeves 31 are not exactly horizontal, In other words, the

end faces of the web 33 are inclined downward and rearward relative to atruly vertical plane and the bolts 34 and sleeves 31 are inclineddownward and forward relative to a truly horizontal plane and thus thevertical flanges of the angle irons 22 and 23 are nottruly vertical butare inclined upward and forward while the horizontal flanges of theangle irons 22 and 23 are inclined downward and forward at a slightangle to the horizontal. As illustrated in the drawings, the inclinationor forward tilt of the axle, therefore, is approximately three degreesfrom a true vertical plane, though the pin 37 is truly vertical. is avery important feature of the invention as will appear hereinafter.

Mounted between the extremities of the angle irons 22 and 23 whichconstitute the axle, are the knuckles 38 for the wheels 39, theseknuckles being pivoted upon pivot pins 40 extending through the angleirons 22 and 23 of the axle parallel to the bolts 34 and, therefore,these pivot pins 40 extend downward and forward at a slight inclinationto the horizontal plane. The knuckles 33 have upwardly extending arms 41which are connected by transverse link bars 42 pivoted to the arms 41.Each link bar carries upon it at its middle or in any desired position,the curved or downwardly bowed rack 43. Mounted in the axle are thepinions 44 which engage the rack 43. Each pinion 44 is mounted upon ashaft extending through the angle irons 22 and 23 and between theseangle irons is mounted a worm wheel 45 with which a vertical worm shaft46 engages having a hand wheel (not shown) at its upper end whereby theshaft may be rotated. By rotating the shaft in one direction or theother, the connecting bar 42 is shifted in one direction or the other,thus tilting the wheels 39 from a median position in one direction orthe other. Any suitable means may be used for shifting the bars 42 andthereby tilting the wheels and I do not wish to be limited to anyparticular means whereby the knuckles may be tilted to tilt the wheels.

For the purpose of shifting the parallel link bars or rear sections 24of the frame from a median position toward the right or toward the leftto thereby angle the supporting frame or angle the front and rearsections of the supporting frame with reference to each other, I mountupon the rear of the forward supporting frame the screw 4'7 which ismounted in suitable bearings and carries a traveling nut 48 slidablycarried upon a transverse guide 49. This nut 48 is pivotally connectedto a link 50 which link at one end is operatively pivoted to thesections or links 24 which constitute the rear frame in a manner to belater explained.

The screw 47 is rotated by any suitable means controlled by theoperator, as for instance, by a bevel gear 51 mounted upon the screw 47and engaging the bevel gear 52 mounted upon a vertical shaft 53 whichcarries a hand wheel (not shown) Thus by rotating the screw 47 in onedirection or the other the links or rear sections 24 and the rear axlemay be shifted toward the right or toward the left from a medianposition. I do not wish to be limited to any particular means forshifting these rear sections 24 and the rear axle therewith, that is, toany particular means for angling the forward and rear sections of theframe as other means than that shown might be used without departingfrom the spirit of the invention. It will be seen now that, withoutregard to the position of the rear section of the supporting frame andthe rear axle, whether'in an intermediate position or an offset orangled position, that if the wheels 39 are disposed in a verticalposition and not canted, the wheels will tend to run straight ahead, butif the wheels are canted outward at the top and toward the left handside of the machine, the plane of the wheel, because the pivot 40 isdisposed in a plane inclined to the horizontal, will be at an angle tothe line of draft so that the left hand wheel will be inclined forwardand away from the line of draft while the right hand wheel will beinclined toward the line of draft, that is, the longitudinal axis of themachine. If on the other hand, the left hand wheel is canted outward atthe bottom and inward at the top of the wheel and the right hand wheelis in parallel relation, as, of course, it must be; the wheels 39 willthen be so turned in a horizontal plane that they will tend to skew therear of the machine toward the right instead of toward the left.

In other words, if the pivots 40 of the wheel knuckles were disposed ina vertical plane, the wheels would then act as steering wheels. If thepivots 49 of the knuckles were disposed in an absolutely horizontalplane, the wheels 39 would then simply perform the function of leaningwheels resisting lateral draft but if the pivot pins 40 are disposed atan inclination to the horizontal, they will act both as leaning wheelsand as steering wheels for the rear end of the machine and the degree oftheir angle to the line of draft or longitudinal axis of the machinewill depend entirely upon the angle of the pivot pins 40 to thehorizontal.

While I have illustrated the pivot pins 40 as having an inclination ofthree degrees to a horizontal plane, I, of course, do not wish to belimited to this as it might be desirable to have these pivot pins tiltedto as much as eight or ten degrees or anywhere between these degrees orless than three degrees if desired. I have illustrated the axle itselfas being tilted at a three degree angle relative to a vertical plane tothus tilt the pivot pins 40 at a three degree angle to a horizontalplane, but I do not wish to be limited to an axle which is tilted, as itis only necessary that the pivot pins should be tilted with reference toa horizontal plane. For practical reasons, however, it is best to formthe axle so that it is tilted in this manner as thus the pivot pins 40will extend through the axle at right angles to the planes of the angleirons thereof and the connection of the pivot pins to the axle will be,therefore, much more rigid and strong.

It is necessary to provide some means for supporting the rear end of thefront section of the grader upon the swinging rear sections 24. To thisend, I attach to the rear sections or links 24 the transverselyextending parallel angle irons 54 as shown most clearly in Figures 2 and4. These angle irons are connected to the swinging sections 24 by meansof pins 55 passing through the shanks 27 and held in place by the nuts56. These pins are square at their upper ends and extend down betweenthe upwardly extending flanges of the angle irons 54 and the pins 55 arepinned to the angle irons bythe transverse pins 55a (see Figure 2). Theangle irons 54 are parallel to each other and extend through and areslidable in the downwardly and inwardly turned flanges 57 of slides 58(see Figure 2). These slides 58 are slidably mounted upon thelongitudinal angle irons 17 as shown in Figure 4.

Thus it will be seen that the angle irons 54 slide transversely throughthe members 58 and the draft of the machine.

members 58 in turn slide upon the angle irons 17. Thus these links orrear sections 24 have sliding engagement with the rear ends of the frontsection of the machine and an efficient support is provided for thisrear section. The link is pivotally connected at 59 to a plate 60 inturn connected to the sliding angle irons 54 and thus as the nut 48 isshifted to the right or to the left, the angle irons 54 are shifted tothe right 01' to the left carrying with them the links or rear sections24.

While the above stated construction is a preferable one, it will beunderstood that the detailed construction might be modified in many wayswithout departing from the spirit of the invention as defined in theappended claims.

While I have hereinbefore referred to this machine as being used forwidening roadways while the mold board is in a bank sloping position, Iwish to point out that the mechanism for varying the direction of travelof the rear wheels also operates efiectively when the mold board is incertain bank sloping positions to move the cut material toward thecenter of the roadway. For instance, if the machine is travelingforwardly with the mold board at the right hand side of the machine inbank sloping position for cutting material and moving it inside of thepath of travel of the right hand rear wheel 39 as viewed in Figure 3,the tendency would be for the rear end of the machine to be shifted awayfrom the center of the roadway. Now by operating the leaning wheelmechanism so that the rear wheels may be kept in vertical planes withthe right hand 1 rear wheel at a lower level, as for instance, in aditch, at the side of the roadway and with the left hand rear wheel upon the roadway, and the rear axle frame 22 inclined downwardly from theleft toward the right as viewed in Figure 3, the

outer end of the spindle of the right hand knuckle 38 will be thrownforwardly and the outer end of the spindle of the left hand knuckle 38will be thrown rearwardly, thereby changing the direction of travel ofthe rear wheels toward the center of the roadway. The change ofdirection of travel ground. The shifting tendency of the mold board willconsequently be effectively counteracted. It should be particularlynoted that this is accomplished while maintaining the rear axle frame23, 23 at all times at right angles to the line of The means foradjusting the rear wheels relative to the rear axle frame 23, 23 beingindependent of the mechanism for effecting lateral shifting of the saidaxle frame.

It is to be particularly noted that shifting of the rear axle to theright or left of the center line of the machine has nothing whatever todo with causing the wheels to run toward the blade or toward one side ofthe road or the other side of the road. Therefore, if the axle isshifted toward the left and it is desired to have the wheels run to theright, the wheels are leaned to the right and if it be desirable thatthey run to the left, under the same circumstances, the wheels areleaned to the left. This is particularly advis able where, as in banksloping, as before remarked, it may be desirable to shift the rear axleto the left and yet have the rear wheels tend to run toward the right.In my construction, the canting of the rear wheels from a vertical planein one direction or the other tends to cause the rear end of the machineto move toward the left or toward the right and this without referenceto whether the forward and rear sections of the machine have been angledwith reference to each other or not.

With this construction, I not only provide a leaning wheel resistance toside draft, but I provide for automatically turning the rear wheels in adirection tending to shift the rear of the machine toward the work, thusfurther resisting this side draft, which side draft is particularlypowerful in machines of this type.

I claim:-

1. An implement of the character described, having forward wheels, arear axle and rear wheels, the rear wheels being mounted upon'the rearaxle for tilting movement toward or from a vertical plane, and thepivotal connection of the rear wheels to the rear axle being disposed ona downward and forward inclination.

2. An implement of the character described having an axle and wheelstiltably mounted upon the axle for movement toward or from a verticalplane, the pivotal connection of each wheel to the axle having its axisdisposed at an inclination to a horizontal plane.

3. An implement of the character described having a supporting frameformed of flexibly connected front and rear sections, a forward axlehaving forward wheels, 2. rear axle, wheels tiltably mounted upon therear axle, toward or from a vertical plane, the pivotal connections ofthe rear wheels to the rear axle being disposed with their axesextending downward and forward with relation to a horizontal plane.

4. An implement of the character described,

having a supporting frame formed of flexibly I connected front and rearsections whereby the sections may be angled laterally with relation toeach other, a front axle having forward wheels, a rear axle upon whichthe rear sections are supported, knuckles pivotally mounted upon therear axle for oscillation in an inclined plane, wheels mounted upon theknuckles, and manually operable means for tilting said wheels from ortoward a vertical plane, the pivotal connections of the knuckles to therear axle having their axes dis posed at an inclination to thehorizontal and at right angles to said inclined plane whereby after saidwheels are tilted, said knuckles will be turned in said inclined plane.

5. An implement of the character described, having a supportingframeformed of flexibly connected front and rear sections, a forwardaxle and forward wheels for the forward section, a rear axle supportingthe rear section, knuckles pivotally connected to the rear axle, eachknuckle oscillating upon an axis extending downward and forward at aninclination to a horizontal plane, wheels mounted upon the knuckles,each knuckle having an arm, a connecting rod between the arms and theknuckles, and manually operable means for shifting the connecting rod inone direction or the other to thus tilt the wheels.

6. An implement of the character described, having a supporting frameformed of flexibly connected front and rear sections, means for anglingsaid sections with relation to each other, the forward axle havingforward wheels, a rear axle upon which the rear supporting section ismounted, knuckles pivotally mounted upon the rear axle, the axis foreach knuckle being approximately parallel to the line of draft but beingdisposed at an angle to a horizontal plane,

wheels mounted upon the knuckles, and manually controllable meanswhereby the knuckles and wheels may be tilted.

'7. An implement of the character described, formed of flexiblyconnected front and rear sections, a forward axle and forward wheels onthe forward section, a rear axle comprising two horizontally spacedmembers, the confronting faces of the members being disposed at an angleto a vertical plane, pivot blocks disposed between and spacing themembers apart and each having a plurality of passages at right angles tothe confronting faces of the said members, and each having a pivot boltpassage, bolts extending through the members and the first namedpassages, the rear sections of the supporting frame having forks attheir rear ends embracing the axle and said blocks, pivot bolts passingthrough said forks and the vertical passages in the blocks, and rearwheels tiltably mounted on the axle, the axis for each wheel extendingforward and rearward and being disposed at an angle to a horizontalplane.

, 8. An implement of the character described, having a supporting frameformed of flexibly connected front and rear sections, a forward axle andforward wheels for the forward section, a rear axle comprising twohorizontally spaced angle irons, the confronting faces of the angleirons being disposed at an angle to a vertical plane, pivot blocksdisposed between the angle irons and spacing them apart, each blockbeing formed to provide a medial vertical web having end faces engagingagainst the inner faces of the angle irons, and integral sleeves onopposite sides of and parallel with the web defining bolt passages, theblock having at its center a vertical sleeve, constituting a boltpassage, there being webs integrally connecting the vertical sleeve 1with the first named web and the first named sleeves, the rear ends ofthe rear sections of the supporting frame having forks embracing therear axle and said blocks and having alined bolt openings, bolts passingthrough the angle irons and said first-named sleeves, pivot boltspassing through the alined openings of the fork and through the secondnamed sleeves, and rear wheels having knuckles pivotally mounted on theextremities of the axle, the pivotal axis for each ,knuckle beingdisposed at an inclination to a horizontal plane, and means for tiltingsaid knuckles and the rear wheels.

9. An implement of the character described having a supporting frameformed of flexibly conheated front and rear sections, a forward axle andforward wheels for the forward section, a rear axle disposed rearward ofthe front section, the front section having horizontal portions extending toward the rear axle, a pair of links pivotally connected to thefront section forward of the rear end thereof and pivotally connected tothe rear axle, a transverse bar pivotally connected to said links andextending beneath the horizontal portions at the rear of the forwardsection, and members slidingly mounted upon the horizontal portions ofthe forward section for movement parallel to the line of draft, thetransverse bar connecting the links having sliding engagement with saidmembers.

10. An implement of the character described, having a supporting frameformed of a forward section and a rear section, a forward axle andforward wheels on the forward section, the forward section at its rearend having horizontal elements, a rear axle disposed rearward of thehorizontal elements of the forward section, links constituting the rearsection of the frame and pivotally connected to the forward section ofthe frame and operating beneath the horizontal elements of the forwardsection, a pair of transversely extending bars pivoted to said links andmoving transversely with the links, and means for securing slidingengagement of the bars with the horizontal elements of the forwardsection. lL'An implement of the character described, having a supportingframe formed of a forward section and a rear section, a forward axle andforward wheels on the forward section, the forward section at its rearend having horizontal elements, a rear axle disposed rearward of thehorizontal elements of the forward section, links constituting the rearsection of the frame and pivotally connected to the forward section ofthe frame and operating beneath the horizontal elements of the forwardsection, a pair of transversely extending bars pivoted to said links andmoving transversely with the links, slides mounted upon the horizontalelements of the forwardsection for movement parallel to the line ofdraft, the slides having downwardly extending inturned flanges embracingthe transverse bars and through which the transverse bars slide.

12. An implement of the character described, comprising a forwardsection and a rear section, the forward section having at its forwardend a front axle and front wheels, said forward section comprising aframe including horizontally extending elements at the rear end of theframe and vertical elements at the forward ends of the horizontalelements, a rear axle disposed rearward of the horizontal elements,links constituting rear section ofthe frame and having forks at theirrear ends pivotally connected to the rear axle, bolts mounted upon thevertical elements and extending downward through the forward ends of thelinks whereby to pivotally connect the links of the rear section to theforward section a pairof angle irons extending transversely beneath therear ends of the horizontal elements, pins pivotally connecting saidangle irons to the rear ends of the links, members slidingly mountedupon the horizontal elements for movement parallel to the line of draftand through which members the transverse angle irons slide, atransversely extending screw mounted upon the horizontal elements,manually operable means for rotating said screw, a traveling nut mountedupon the screw and an operative connection between said traveling nutand said transversely extending angle irons.

13. An implement of the character described including a supporting framecomprising a front section and forward wheels supporting the frontsection, a rear section comprising a rear axle having supporting wheels,and links pivotally connecting said rear axle to the front section, saidlinks comprising elongated U-shaped members operatively pivoted at theirbight ends to the forward section, members forked at their rear ends toembrace the rear axle and at their forward ends bolted to the rear endportions of said U-shaped members, and pivot pins extending through theforked ends of said members and the rear axle.

14.. A road grader of the character described having an axle, wheels andknuckles upon which the wheels are mounted, the knuckles being pivotedto the axle, the pivotal axes of the knuckles being inclined forward anddownward relative to a horizontal plane whereby as the wheels aretilted, said knuckles will be shifted in a plane extending at rightangles to the axes of said knuckles.

15. A road grader comprising an adjustable mold board, a rear axleframe, means for shifting said rear axle later-ally while confining itto positions at right angles to the line of draft, spacedapart rearwheels at the ends of said axle frame, mechanism for supporting saidrear wheels for adjustment in inclination and direction of travelrelative to the said line of draft, and means for adjusting saidsupporting mechanism independently of said shifting means to vary theinclination and direction of travel of said wheels while said axle frameremains at right angles to said line of draft.

16. A road grader comprising an adjustable mold board, a rear axle,parallel motion mechanism for shifting said rear axle laterally,spacedapart rear wheels, knuckles serving as journal supports for saidwheels, means for supporting said knuckles at the ends of said axle onaxes at right angles to the axes of said wheels and inclined relative toa horizontal plane through said axle, and means operable independentlyof said parallel motion mechanism for adjusting the positions of saidknuckles to vary the inclination and direction of travel of said wheels.

1'7. A road grader comprising a mold board, a rear axle, horizontalparallel motion mechanism for shifting said axle laterally whilemaintaining the latter at right angles to the line of draft of themachine, spaced-apart rear wheels, knuckles serving as journal supportsfor said Wheels and pivoted to the ends of said axle on axes inclinedrelative to a horizontal plane extending through said axle, uprightparallel motion mechanism for adjusting said'knuckles on said axes, andmeans for operating said upright parallel motion mechanism independentlyof said horizontal parallel motion mechanism.

18. A road grader comprising an adjustable mold board, a rear axle,means for shifting the rear axle laterally while maintaining the same atright angles to the line of draft of the machine, spaced-apart rearwheels, knuckles for said wheels pivoted to said axle on axes inclinedrelative to a horizontal plane through said axle, and means foradjusting the positions of said knuckles to vary the inclinations ofsaid wheels and their directions of travel to enable said mold board tocut off an upwardly sloping bank and move the material further away fromthe center of the road.

19. A road grader having a supporting frame, a mold board adjustablycarried thereby, front Wheels, rear wheels, a rear axle frame connectedto said supporting frame to remain at all times at right angles to theline of draft of the grader, knuckles providing axles for the rearwheels, and means for pivotally mounting said knuckles on said axleframe on axes inclined relative to a horizontal plane.

20. A road grader comprising an adjustable mold board, a rear axleframe, means comprising parallel motion mechanism for shifting said rearaxle frame laterally while maintaining the same at right angles to theline of draft of the machine, spaced apart rear wheels, and means formounting said rear wheels on said axle frame for adjustment of theleaning of said wheels, and their direction of travel relative to thesaid line of draft independently of said parallel motion mechanism toenable the travel of the rear wheels to counter-act the tendency of'themold board to shift the rear end of the machine laterally during theoperation of cutting an upwardly sloping bank.

21. A road grader including a mold board adapted to be disposed in anangular position relative to the line of draft of the machine, a rearaxle frame, means for shifting said rear axle frame laterally whilemaintaining the same at all. times at right angles to the said line ofdraft, and mechanism independent of said shifting means for adjustingthe leaning of the saidwheels in their direction of travel relative tosaid line of draft while said axle frame remains at right angles to saidline of draft.

FRANKLIN E. ARNDT.

